Grate



(No Model.) .1l-MOB. GRAHAM.

y GRATE. I No. 292.215. Patented Jan. 22 1884.

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UNITED STATES PATENT OEEICE.

DANIEL MOBRIDE GRAHAM, OF CHICAGO, ILLINOIS?- GRATE.`

SPECIFICATION forming part of Letters Patent NO. 292,215, dated January 22,1884.

Application filed May 1, 1883. (No model.)

To @ZZ whom it may concern:

Be it known that I, DANIEL McBRIDE GRA- HAM, of Chicago, in. the county of Cook, of the State of Illinois, have invented a new and useful Improvement in Range, Stove, or Fire-Place Grates; and I do hereby declare the same to be described in the following specifi cation and represented in the accompanying drawings, of whichi Figure 1 is a top view, Fig. 2 a transverse section, and Fig. 3 a longitudinal section, of a grate constructed in accordance with my invention, the nature of which is dened in the claims hereinafter presented.

In this grate the bars, except those at the immediate front of it, are tubular-that is, each is a tube which at its middle and lower part is horizontal, from whence it is bent upward between the middle and each end of it, it being near each of its upper ends bent inward and downward, all being as represented in the drawings, in which A A A2 A3 are the main or tubular grate-bars, and B B B the auxiliary or front bars, each of these latter being solid and fixed at its ends to the foremost tubular-bar A. The'several main bars communicate at their middles by short vertical pipes c with an air-box, C, arranged beneath them, and 'provided with a register, D, for regulating the admission of air into it. Furthermore, each main bar at its upper end extends inward a greater distance than the main bar vnext in front of it, such being as shown in Figs. 1 and 3, and in orderto have between the turned-down or eduction ends of the several main bars a space for the introduction of fuel into the grate, the several turned-down parts of Ythe main bars being open, so as to.discharge air directly downward upon the fuel, in order to facilitate the burning of the smoke and the combustible gases escaping therefrom when such fuel may be on re.

In the operation of this grate, air from the box O Will flow into,-through, and out of the several tubular bars Af A2, and in so doingwill be heated by them, Vand in such state will be discharged with force upon the fuel or into its smoke and combustible gases. By the heat from the grate-bars being absorbed by the air they will be kept at a lower temperature than would otherwise be the case, and consequently will be more enduring.

I claim- 1. In the tubular grate, the several aircon ducting bars thereof, formed or constructed at their upper ends to discharge air down- Ward into the grate, and having the ends of each of such bars arranged to extend inward a distance greater than those of the bar next in advance. Y

2. A grate having tubular bars bent or constructed at their upper ends, so as to discharge air downward intoit, (the said grate) and each provided with an air-induct at its middle or lower part.

3. A grate having tubular side and bottom bars, A A', &c., constructed or bent at their upper ends, so as to discharge air downward into it, and also having front bars, B, arranged and combined with the tubular bars, or the front one of the set thereof, substantially as set forth, the said tubular bars being provided with air-inlets, whereby air, when fuel may be in combustion in the grate, may be drawn into the said tubular grate-bars and discharged from them upon the top of such fuel, as set forth.

4. Thecombination ofthe air-box O and its register D with the series of tubular gratebars A- A', Sto., `communicating with said box, and at their upper ends bent downward, or havingeducts to discharge air into the grate or upon the fuel when therein and on fire, as set forth.

5. The combination of the air-box C and its register D, the series of tubular grate-bars A A', &c., and the series of front grate-bars, B, arranged and adapted substantially as set forth DANIEL MOBBIDE GRAHAM.

Vitnesses:

R. H. EDDY, E. BpPRATT. 

